Here is a very good example of a heavy 1 stamp.
https://www.milsurps.com/images/impo...42Lithy3-1.jpg
2 1941 Lithgows both with a black finish
https://www.milsurps.com/images/impo.../B68727a-1.jpg
https://www.milsurps.com/images/impo.../B68727c-1.jpg
https://www.milsurps.com/images/impo...LithyTM6-1.jpg
https://www.milsurps.com/images/impo.../B68727e-1.jpg
& a good close-up showing paint chipped off from the stamping.
https://www.milsurps.com/images/impo...LithyTM8-1.jpg
https://www.milsurps.com/images/impo...ITHYmain-1.jpg
https://www.milsurps.com/images/impo.../B69002a-1.jpg
https://www.milsurps.com/images/impo.../B69002b-1.jpg
https://www.milsurps.com/images/impo.../B69002c-1.jpg